Matthew 5:44

But I command you all, love your enemies, and pray for your persecutors;

1 Thessalonians 5:15

See to it that no one ever repays another with evil for evil; but always seek opportunities of doing good both to one another and to all the world.

Luke 6:27-28

"But to you who are listening to me I say, Love your enemies; seek the welfare of those who hate you;

Romans 12:17-21

Pay back to no man evil for evil. Take thought for what is right and seemly in every one's esteem.

Treasury of Scripture Knowledge

Summary

If thou meet thine enemy's ox or his ass going astray, thou shalt surely bring it back to him again.

Bible References

General references

Matthew 5:44
But I command you all, love your enemies, and pray for your persecutors;
Luke 6:27
"But to you who are listening to me I say, Love your enemies; seek the welfare of those who hate you;
Romans 12:17
Pay back to no man evil for evil. Take thought for what is right and seemly in every one's esteem.
1 Thessalonians 5:15
See to it that no one ever repays another with evil for evil; but always seek opportunities of doing good both to one another and to all the world.